⚠️HURRY PLEASE⚠️FAST IM TIMED⚠️
Which label belongs in the region marked X? Jen makes a Venn diagram to compare active transport and passive transport
a..Moves molecules
b.. Uses energy
c..Moves from low concentration to high concentration
d ..Moves from high concentration to low concentration
Answer:
A
Explanation:
exam review :)
Which of the following is not a clue that a chemical reaction has taken place? *
4 points
A solid is formed when two clear solutions are mixed.
A clear solution is added to a red solution, and the result is a blue solution.
A solid is added to water and bubbles form.
A pure solid is heated and turns into a pure liquid.
Answer:
A pure solid is heated and turns into a pure liquid.
Explanation:
No colour change recorded, only change of state, hence this is a physical change - physical changes I.e. change of state and temperature are not chemical reactions.
Good day please help me thank you
Answer:
D Transportation it makes sence if it doesn't just re read it
Answer fast please What system is the stomach part of
A. Circulatory
B. Respiratory
C. Skeletal
D. Digestive
Answer:
the answer is D
Explanation:
i just took the test
Which Ion has the same electron configuration as an Ar atom
1. Cl -
2. F -
3. Li+
4. Na +
How might water high specific heat capacity affect energy distribution and temperature on earth
Answer:
Water can hold a lot of heat inside it and as the climate starts getting cold, the water releases the heat which heats up the climate
Due to the fact that water has a high heat capacity, its temperature has a very limited range, which causes the coastal areas close to having a similar small daily and seasonal temperature range.
What is specific heat capacity?"When the temperature of a material rises 1 K (or 1 °C), the amount of heat (J) absorbed per unit mass (kg)".
When the weather begins to grow chilly, water releases the heat it has stored inside, warming the environment.
High specific heat of the water makes it temperature resistant, and it helps the earth to maintain its temperature and helps organisms to maintain their functions at a constant temperature of the earth.
Thus, the normal temperature is necessary for maintaining the temperature of the earth and the water bodies maintain the temperature of the earth.
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Can a substance be a Lewis acid without being a Bronsted-Lowry acid?
Please argue on it
Answer:
Yes. Since for a substance to be a Bronsted-Lowry acid they have to be able to donate protons, and to be a Lewis acid a substance would have to accept electrons, there are substances which cannot donate protons but can accept electrons.
Explanation:
Hope this helped!
Compared to ionic compounds, molecular compounds generally have
A. stronger chemical bonds.
B. poor conductivity.
C. a high melting point.
D. lower densities.
Please help I will mark brainy
Answer:
the answer is c I took the test
a compared of magnesium nitric contains 72% of magnesium and 28% of nitrogen. what is the empirical formula of magnesium nitric.
and the answer is Mg 3 N 2
how to do the solution.
The empirical formula is the smallest comparison of atoms of compound =mole ratio of the components
The principle of determining empirical formula
• Determine the mass ratio of the constituent elements of the compound.
• Determine the mole ratio by dividing the percentage by the atomic mass
The empirical formula :
mol ratio Mg : N ⇒
[tex]\tt =\dfrac{72}{24~g/mol}\div \dfrac{28}{14~g/mol}\\\\=3\div 2\rightarrow Mg_3N_2[/tex]
In if the reaction below 49 grams of Fe3O4 produces a 78.25% yield of Fe. How many grams are produced? Fe3O4 + 4H2 = 3Fe + 4H2O
Imagine the = is an arrow
Fe produced : 27.53 g
Further explanationReaction
Fe₃O₄ + 4H₂ = 3Fe + 4H₂O
mol Fe₃O₄ (MW=233.55 g/mol) :
[tex]\tt \dfrac{49}{233.55 g/mol}=0.21[/tex]
mol ratio Fe₃O₄ : Fe = 1 : 3, so mol Fe :
[tex]\tt 3\times 0.21=0.63~g/mol[/tex]
mass Fe(Ar=55,845 g/mol)
[tex]\tt 0.63\times 55,845=35.18~g[/tex]
grams produced :
[tex]\tt \%yield=\dfrac{actual}{theoretical}\times 100\%\\\\actual=\%yield\times theoretical\\\\actual=78.25\%\times 35.18\\\\actual=27.53~g[/tex]
I need to someone to explain the whole being of Chemistry. I do not understand a single thing, nothing makes sense to me. Literally, I'm going to fail this class because I do NOT understand a single thing taught to me. Maybe it's because I was mistakenly put into Chemistry Pre AP instead of on level but it's so hard and- I just do not get it.
Answer:
Explanation:
In Pre-AP Chemistry, the development of models to explain their macroscopic observations is a primary means through which students develop an understanding of the molecular world.
You will be forced to think and apply concepts to new situations, and even derive your own theories from application. This is excellent preparation for the higher levels of thinking required in college.
Chemistry, the science that deals with the properties, composition, and structure of substances (defined as elements and compounds), the transformations they undergo, and the energy that is released or absorbed during these processes.
Mesohippus is the smallest skeleton: skull has a low sloped forehead, legs have three toes. Merychippus is the next largest skeleton, lower jaw of the skull is larger and forehead is higher, the leg has three toes with the toes on the side higher than the center toe. Pliohippus skeleton is larger, legs and neck are longer, the jaw on the skull is much larger and the forehead has the greatest slope of the four skeletons shown, the legs have only a center toe that resembles a hoof. Equus is the largest skeleton with the longest legs, no toes and a hoof.
Paleontologists have discovered several ancestors of the modern horse.
Based on the skeleton, the skull, and the leg bones, which fossil is the oldest?
Which fossil is most like a modern horse?
Answer:
1) Mesohippus
2) Equus
Explanation:
just did it on e2020
Answer:
Based on the skeleton, the skull, and the leg bones, which fossil is the oldest?
✔ Mesohippus
Which fossil is most like a modern horse?
✔ Equus
I literally forgot!
What is chemistry?
Answer:
Chemistry, the science that deals with the properties, composition, and structure of substances (defined as elements and compounds), the transformations they undergo, and the energy that is released or absorbed during these processes
Answer:
hope it helps you a little
Sub teacher didn't explain at all :(
Answer:
tell your teacher when he/she get back report him/she
What is the percent of SO2 in H2SO4?
Help Please
The percent of SO₂ in H₂SO₄ : 65.3%
Further explanationProust states the Comparative Law that compounds are formed from elements with the same Mass Comparison so that compounds have a fixed composition of elements
%Mass A in AxBy =
[tex]\tt \dfrac{x.Ar~A}{MW~A_xB_y}\times 100\%[/tex]
For SO₂ in H₂SO₄ :
MW SO₂ = 32 + 2.16=64 g/mol
MW H₂SO₄ =2.1+32+4.16=98 g/mol
The percent of SO₂ :
[tex]\tt \dfrac{64}{98}\times 100\%=65.3\%[/tex]
How many moles of Mg are present in 62.23 grams of Mg? (Show your calculations for full credit.)
Someone please help will mark as brainliest
Answer:
4. A subscript is a sentence below a line. You cannot change subscripts in a chemical formula to balance a chemical equation
5. where's/whats the equation??
6. ^^^
Explanation:
I need to know if is true or false please
Answer:
True
Explanation:
I NEED HELPPPPPP ASAP
Answer:
1. Reactants collect in chloroplasts
2. A chemical reaction occurs
3. Products result as food and water
How are Earth's continents related?
Please help due at 11:45!
19. Luke wants to create an aqueous solution that conducts electricity. Which of the following compounds should
he use?
a) KNO3
b) C12H22O11
c) C2H5OH
d) NH4OH
Answer:
I think b) C12H22O11.
Hope this answer is helpful for u.
When a piece of paper with words on it is placed behind a clear jar of water the letters seem to change size. Some appear larger, and others appear smaller. Why does this happen? What is light doing to make the letters appear differently?
Answer:
because of the process of refraction of light.
Explanation:
Note, the term refraction refers to the process which results in the bending of light as it passes through a medium. This bending of light can make objects become magnified (or larger), or even smaller.
In this scenario, as the light passes slowly through water it affects how we perceive the objects (the words on the paper) behind the jar (more likely a glass jar). In other words, the light combined with the water refracts (changes direction of) the lights our eyes can see, making the letters seem to change size.
Which is an example of an object increasing its kinetic energy
Question 3 options:
an airplane after landing on a level runway.
a rocket before launch.
a train stopped at the station.
a mouse running faster after spotting a cat.
Answer:
The answer to this question is the A choice. A rocket before launch.
Explanation:
In the definition of kinetic energy, it says: In physics, the kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes.
1. Which of the following is a typical characteristic of ionic solids?
A. low melting point
C. no conductivity in solution
B. soft and malleable
D. neutral net charge
Compared to ionic compounds, molecular compounds generally have
A. good conductivity.
B. greater densities.
C. more chemical bonds.
D. a low boiling point.
Compared to ionic compounds, molecular compounds generally have a low boiling point and the correct option is option D.
What are Molecular compounds?
Molecular compounds are held together by covalent bonds. They are also called covalent compounds.
Covalent bonds are responsible for many of the properties of covalent compounds. Covalent compounds have relatively low boiling points, cannot conduct electricity, and may not dissolve in water.
Unlike ionic compounds, covalent compounds do not have freely moving electrons, so they cannot conduct electricity.
The individual molecules of covalent compounds are more easily separated than the ions in a crystal, so most covalent compounds have relatively low boiling points.
Therefore, compared to ionic compounds, molecular compounds generally have a low boiling point and the correct option is option D.
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Which choice confirms that one air mass is being replaced by another air mass in a given area?
A. increase in wind
B. high air pressure
C. high air temperature
D. it is impossible to tell.
Answer:
Answer is A
Explanation:
Increase in wind
Which part of the planet receives the most solar radiation?
A. oceans
B. Polar regions
C. Equator
Pls help me!!
Answer:
C
Explanation:
the sun's rays strike the earth's surface mostly directly at the equator
How many moles of water are produced when 5 moles of hydrogen gas react with 2 moles of oxygen gas?
Balanced equation: 2H2 + O2 → 2H2O (5 points)
a. 2 moles of water
b. 4 moles of water
c. 5 moles of water
d. 7 moles of water
Answer:
It is b
Explanation: I did it on the test and got it right
The moles of water are produced when 5 moles of hydrogen gas react with 2 moles of oxygen gas - b. 4 moles of water
The stoichiometric coefficients can be considered in a balanced equation as moles of reactants needed or moles of products formed in the reaction.
In the given case, the balanced chemical equation for this synthesis reaction looks like this2H2 + O2 → 2H2O
from the balanced equation, it is clear that the 2 moles of hydrogen gas and 1 mole of oxygen gas are required to produce 2 moles of water. so it means that the reaction produces twice as many moles of water as you have moles of oxygen gas that take part in the reaction and the same moles as hydrogen atoms present.Here it is given that there are only 2 moles of oxygen which means it is in deficiency however, it will produce 4 moles of water with four moles of hydrogen.Thus, the moles of water are produced when 5 moles of hydrogen gas react with 2 moles of oxygen gas - b. 4 moles of water
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What is the mass of oxygen in 25.0 grams of potassium permanganate , KMnO4?
Answer:
10.76 grams
Explanation:
Given that the amount of [tex]KMnO_4[/tex] is 25.0 grams.
Mass of 1 mole of [tex]KMnO_4[/tex] = 158 grams
The number of atoms in 1 mole of [tex]KMnO_4[/tex] is 4.
Mass of oxygen in 1 mole of [tex]KMnO_4[/tex] = 16\times 4 = 68 grams.
Here, 158 grams of [tex]KMnO_4[/tex] has 68 grams of oxygen
So, the amount of oxygen in 1 gram of [tex]KMnO_4[/tex] = 68/158 grams
Therefore, the amount of oxygen in 1 gram of [tex]KMnO_4[/tex] = [tex]\frac {68}{158}\times 25[/tex] grams
=10.76 grams
Hence, 25 grams of [tex]KMnO_4[/tex] has 10.76 grams of oxygen.
The mass of oxygen in 25.0 grams of potassium permanganate , KMnO4 is 10.13 grams.
molar mass of KMnO₄ = 39 + 55 + 16(4)
molar mass of KMnO₄ = 39 + 55 + 64
molar mass of KMnO₄ = 158 grams
molar mass of oxygen in the compound = 64 g
Therefore,
158g of potassium permanganate has 64 g of oxygen
25 g of potassium permanganate will contain ? of oxygen
cross multiply
mass of oxygen = 25 × 64 / 158
mass of oxygen = 1600 / 158
mass of oxygen = 10.1265822785
mass of oxygen ≈ 10.13 grams
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